Hi I have a 99 sonoma, Shifted it in 4x4 and it won't disengage,I bought a new servo still the same thing, if I take the servo off i can manually shift it into 4x4 or 2x4 but as soon as the motor is put back on it automatically shifts to 4x4 again,is this common ? would it hurt anything to gear it up manually like the past s-10?
I have the same problem with my 99 GMC sierra. Went into 4X4 and will not come out. You can hear the shift motor running when you push the buttons, but does not shift out. Note, I did not put it into 4X4 it went there by it self.
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You have to put the truck in neutral first then switch the 4hi and don't use the auto select. If it still won't switch you may have damaged the servo and need to replace it. Or worse damaged the transfer case. So try in neutral first and hope that works.
This is very strange because of How the low range is engaged. I drive a 1999 F150 4x4 which has the same dash and controls for the 4x4 as your Expedition. I do know that the fan control switch is unfortunately the same shape and very close to the 4x4 switch. It is easy to grab the wrong knob and turn the wrong thing than was intended.
My initial impression is if it is possible, your girl could have reached over to move the fan switch and actual grabbed the 4x4 switch instead. Or you were warming up the Expedition and meant to turn up the fan and instead turned the 4x4 switch to Low. Or a backpack she was moving with schoolbooks could have hit the switch. What puzzles me is that to go into Low range, you need a foot on the Brake and simultaneously need the gearshift in Neutral and the 4x4 selector in Low. That is 3 things to make the low range happen.
Even if your foot was on the Brake and the sensors caught the gearshift going through Neutral on its travel to Park, the 4x4 Selector would have to be in Low. There is one problem you can have with the 4x4 Selector.***The Selector has 3 Resistors and a LED bulb.***
You stated the Selector switch was good. This would mean there were 3 different Voltages under the vehicle. Sometimes when the LED bulb burns out, it shifts the Voltage out of range for the Servo, and although the Selector says one thing, the Voltage at the Servo has the wrong value for that function. Since the dash light and the Servo agree on Low, it would seem the Selector is out of sync with the other 2 parts.
I hope my solution is very helpful in solving your problem.
You need to put the vehicle in Neutral, foot on brake, and then turn the Selector to the other 2 positions that you want.
If you have done this and the vehicle does not change gears, try shifting into Reverse and moving the vehicle slightly, then try the Neutral procedures again.
If this still fails to work, the problem is a mechanical component. There is an Electric Servo which uses a single feed wire from the dash Selector. The feed wire carries 3 different Voltages which moves the Servo 3 different positions. The Selector on the dash has the resistors and if bad will not send the correct Voltage to the Servo. The Voltage can be measured at the feed wire.
The other possibility is the Servo is stuck. This is why my second recommendation was to shift to Reverse, which was an attempt to unload pressure on the Servo stem, to free it.
I hope my solution is helpful in solving your problem.